Problem:(adsbygoogle = window.adsbygoogle || []).push({});

An engineer estimates that under the most adverse expected weather conditions, the total force on the highway sign in the figure below will be F = 2.48i - 2.88j kN, acting at the center of mass (CM).

Assume that L1 = 8.13 m and L2 = 6.45 m. What are the x, y, z components of the torque that this force exerts about the base O? Enter components in the order x, y, z.

i knoe that i have to use the formula T = r X F

and F = 2.48i - 2.88j + 0k

i set r = 0i + 8.13j + 6.45k

and using cross product i got T = 18.576i - 15.996j - 20.1624k N*m

the answer is still wrong.... what am i doing wrong?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Finding torque in xyz coordinates

**Physics Forums | Science Articles, Homework Help, Discussion**